Reply to thread

Message: [QUOTE="The Brad, post: 1192902, member: 14154"] Here's a little update. After doing a compression test a few weeks ago, my truck started to crank a little too long before it would start. Most of the time, it would start fine, but every now and then, it would crank for at least 10 seconds and then idle and ICP would go crazy, then it would calm down and run normal, not smooth, but the same rough idle I'm used to. Fast forward to last Tuesday, I left work, drove 3 miles and shut it off. Ten minutes later, I went to start again, and no go. I cranked the starter while watching the gauges on my Torque app. ICP wouldn't go over 270, and IPR was at 65% dc. I had it towed home and found the HPOP reservoir low, so I filled it up and after a bunch of cranking, it started, and once warmed up, ICP was at 470-490 with DC at 9-11% (normal). I took the truck out for a few hard runs and everything was normal and HPOP reservoir was full...until the next day. Anyway, loooong story short, I replaced the ICP sensor (had oil in the plug), new IPR valve, put a gauge on top of the reservoir (40 psi while cranking), and dove under the valve covers to look for o-ring/poppet valve leaks (none found). I finally dead headed the HPOP, filled the reservoir, and the same thing only makes 250psi cranking. Now for my questions. What would make an HPOP fail intermittently? ...and could the bad HPOP allow oil in the reservoir to drain back down to the pan? I left the reservoir full tonight with the pump still dead headed and I'll check it tomorrow. [/QUOTE]